[Polly] Fix for the JSON Exporter

Summary:
Small patch to fix the JSON exporter.

Currently, using "opt -polly-export-jscop" does not generate jscop files, but gives an error:
*** Error in `opt': corrupted double-linked list: 0x0000000000bc4bb0 ***

Updated the function getAccessRelationStr() to work with the current version of getAccessRelation(), fixing the JSON exporter

Reviewers: bollu, grosser

Reviewed By: grosser

Subscribers: grosser, llvm-commits, pollydev

Tags: #polly

Differential Revision: https://reviews.llvm.org/D36370

llvm-svn: 310199

polly/lib/Analysis/ScopInfo.cpp

@@ -701,7 +701,7 @@ std::string MemoryAccess::getNewAccessRelationStr() const {
 }
 
 std::string MemoryAccess::getAccessRelationStr() const {
-  return isl::manage(getAccessRelation().get()).to_str();
+  return getAccessRelation().to_str();
 }
 
 isl::basic_map MemoryAccess::createBasicAccessMap(ScopStmt *Statement) {